Figured this out by doing whois on sp-forums.com, locating the admin email, then discovering the email domain is down displaying same message as sp-forums. In looking at the dns servers I saw who the web host was and looked at their status pages above.

Let's hope it is just that and not our generous host "Marc Köhlbrugge" letting the forums die!

glad to see SP-Forums isn't gonna be down for very long...i don't visit very often, but it really is a great community of fellow beatmakers. i wish they would re-format the site though, to make navigation/chatting/posting content easier like it is here.